US6328475B1 - Air bearing, in particular for the shaft of a motor spindle - Google Patents
Air bearing, in particular for the shaft of a motor spindle Download PDFInfo
- Publication number
- US6328475B1 US6328475B1 US09/508,673 US50867300A US6328475B1 US 6328475 B1 US6328475 B1 US 6328475B1 US 50867300 A US50867300 A US 50867300A US 6328475 B1 US6328475 B1 US 6328475B1
- Authority
- US
- United States
- Prior art keywords
- bearing
- air
- mating
- shaft
- bearing surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000013011 mating Effects 0.000 claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000003754 machining Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 13
- 239000007770 graphite material Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 229910052816 inorganic phosphate Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 abstract description 8
- 229910002804 graphite Inorganic materials 0.000 abstract description 8
- 230000002411 adverse Effects 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910001361 White metal Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010969 white metal Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/16—Sliding surface consisting mainly of graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
- F16C32/0622—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings via nozzles, restrictors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
- F16C32/0696—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for both radial and axial load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2322/00—Apparatus used in shaping articles
- F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S384/00—Bearings
- Y10S384/90—Cooling or heating
- Y10S384/912—Metallic
Definitions
- This invention relates to an air bearing for a rotor adapted to rotate at (high peripheral speed, in particular for the shaft of a motor spindle for driving a machining tool, with provision being made for an air gap between a bearing surface of the rotor and a mating bearing surface of a stationary bearing element, said mating bearing surface having several bearing pockets communicating via bores in the bearing element with a source of compressed air.
- Air bearings of the type referred to are known from DE 21 24 918 A1. They are used primarily for supporting shafts rotating at very high rotational frequency and accordingly high peripheral speed in order to be able to cope with the frictional resistance of the bearing and the resultant heat development in the bearing. With air bearings of this type, the rotor is supported by air cushions that are produced with the aid of air supplied under pressure to the air gap between the bearing surface and the mating bearing surface and which prevent contact between the bearing surface and the mating bearing surface. Contactless bearing of the rotor is guaranteed not only while it is rotating but also when it is stationary. Air bearings are highly sensitive to overloading during operation, i.e., with the rotator rotating at high speed.
- the materials suitable for manufacturing air-lubricated plain bearings are metals, ceramic materials and plastics.
- the use of stainless steels to counter the risk of corrosion is considered possible, but these materials are said as a rule to have poor sliding properties.
- a ceramic material regarded to have good antifrictional and machining properties is metal-impregnated sintered carbon, a porous sintered graphite impregnated with metals such as white metal, lead bronze, antimony or silver.
- an aerostatically supported roller designed for high speeds and low loads, being comprised of a sleeve made of resin-impregnated carbon graphite.
- the sleeve is supported on an inner sleeve made of porous carbon graphite, which is carried by a hub provided with channels for the supply of compressed gas.
- the compressed gas directed through the porous inner sleeve produces a gas film which carries the rotary outer sleeve and centers it relative to the inner sleeve.
- the sleeve slides on the inner sleeve, with the antifrictional properties observed as this occurred having been good.
- this object is accomplished in that the rotor is made of a corrosion-resistant steel alloy having hardened bearing surfaces while the bearing element with the mating bearing surface is made of a densely compacted, air-impervious graphite material.
- the mating of materials as disclosed in the present invention is suitable in particular measure for air bearings, acted upon from outside, of shafts rotating at very high peripheral speed such as are used on motor spindles for the machining of workpieces.
- the antifriction conditions needing to be satisfied in such applications are characterized primarily by a very high energy density because in the start-up and run-out phase the shaft is aerostatically supported, and failure of the air film by overloading of the bearing generally occurs at full shaft speed.
- a further significant advantage of the bearing configuration of the present invention resides in that the bearing can be renewed with little effort if it is damaged by overly frequent or excessively long overloading. And because there is no seizing of the bearing, a damaged bearing can be dismantled without difficulty. As a rule, the bearing surface of the rotor turns out to be undamaged or the damage is slight enough to rectify by lapping.
- FIG. 1 is a cross sectional view of an air bearing for the shaft of a motor spindle
- FIG. 2 is a detail view, on an enlarged scale, of a bearing element with a bearing pocket.
- the drawing shows an air bearing 1 for the radial and axial bearing of the shaft 2 of a high-speed frequency-controlled motor spindle for driving a machining tool.
- the shaft 2 has a cylindrical bearing surface 3 and an annular collar 4 with two parallel, circular-ring shaped bearing surfaces 5 , 6 facing away from each other.
- a housing 7 surrounding the shaft 2 receives therein a sleeve-shaped bearing element 8 with a hollow cylindrical mating bearing surface 9 for radial bearing purposes and, on either side of the annular collar 4 , annular-disk shaped bearing elements 10 with mating bearing surfaces 11 facing each other and lying in radial planes for axial bearing purposes.
- bearing pockets 13 are provided in the mating bearing surface 9 of the bearing element 8 arranged along two spaced circumferential lines so as to be equally spaced apart circumferentially.
- equidistant bearing pockets 13 are arranged in the mating bearing surfaces 11 of the bearing elements 10 on the arc of a circle.
- the bearing pockets 13 are connected via throttle bores 14 to supply bores 15 which are supplied with compressed air via annular grooves 16 in the housing 7 .
- annular chambers 17 communicating with atmosphere either directly or via relief bores 18 are provided adjacent to the mating bearing surfaces 9 , 11 .
- the shaft 2 and the integrally molded annular collar 4 are made of stainless steel.
- the bearing surfaces 3 , 5 , 6 are hardened and manufactured to the highest geometrical accuracy and precision-lapped surfaces.
- the bearing elements 8 , 10 are air-tight electrographite compacts with an inorganic phosphate content of over 3%, e.g., FE 65 or FE 45Y2 electrographite from the company Schunk GmbH in 35452 Heuchelheim, Germany.
- the mating bearing surfaces 9 , 11 exhibit the same geometrical accuracy and surface quality as the bearing surfaces 3 , 5 , 6 .
- the bearing gap between the bearing surfaces and the mating bearing surfaces lies in the range of 0.01 to 0.02 mm.
- air cushions are produced by air supplied under pressure between the bearing surfaces 3 , 5 , 6 and the mating bearing surfaces 9 , 11 in the area of the bearing pockets, thereby centering the bearing surfaces 3 , 5 , 6 of the shaft 2 between the mating bearing surfaces 9 , 11 of the bearing elements 8 , 10 and preventing contact being made between the bearing surfaces and the mating bearing surfaces.
- the continuously supplied air escapes through the bearing gap into the annular chambers 17 , thus achieving the necessary cooling even at high peripheral speeds of 10,000 ms ⁇ 1 and more.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19835339 | 1998-08-05 | ||
DE19835339A DE19835339A1 (de) | 1998-08-05 | 1998-08-05 | Luftlager, insbesondere für die Welle einer Motorspindel |
PCT/DE1999/002360 WO2000008345A1 (de) | 1998-08-05 | 1999-08-03 | Luftlager, insbesondere für die welle einer motorspindel |
Publications (1)
Publication Number | Publication Date |
---|---|
US6328475B1 true US6328475B1 (en) | 2001-12-11 |
Family
ID=7876525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/508,673 Expired - Lifetime US6328475B1 (en) | 1998-05-08 | 1999-08-03 | Air bearing, in particular for the shaft of a motor spindle |
Country Status (5)
Country | Link |
---|---|
US (1) | US6328475B1 (de) |
EP (1) | EP1021660B1 (de) |
DE (2) | DE19835339A1 (de) |
ES (1) | ES2221755T3 (de) |
WO (1) | WO2000008345A1 (de) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040109622A1 (en) * | 2002-04-11 | 2004-06-10 | Yoshio Fujikawa | Externally pressurized gas bearing and spindle equipment using this |
US20040136114A1 (en) * | 2002-07-23 | 2004-07-15 | Toffle Mark A. | Servo track writer with helium bearing |
US7136262B2 (en) * | 2002-08-21 | 2006-11-14 | Minebea Co. Ltd | Pivot assembly preloaded by laser welding for hard disk drive use |
US20060283227A1 (en) * | 2005-06-20 | 2006-12-21 | Monahan Joseph J | Rolling mill roller guide |
US20080187266A1 (en) * | 2007-02-02 | 2008-08-07 | Takanobu Akiyama | Roll machining apparatus |
US20120064814A1 (en) * | 2010-09-15 | 2012-03-15 | Beers Craig M | Shaft for air bearing and motor cooling in compressor |
US8517665B2 (en) | 2010-12-21 | 2013-08-27 | Hamilton Sundstrand Corporation | Thrust bearing shaft for thrust and journal air bearing cooling in an air machine |
US8529192B2 (en) | 2010-09-15 | 2013-09-10 | Hamilton Sundstrand Corporation | Thrust bearing shaft for thrust and journal air bearing cooling in a compressor |
US8734017B1 (en) | 2013-03-08 | 2014-05-27 | Hamilton Sundstrand Corporation | Air bearing shaft |
US20140374506A1 (en) * | 2014-09-08 | 2014-12-25 | Gunnar van der Steur | Composite air bearing assembly |
US9970481B1 (en) | 2017-09-29 | 2018-05-15 | Efc Systems, Inc. | Rotary coating atomizer having vibration damping air bearings |
CN111305912A (zh) * | 2020-02-26 | 2020-06-19 | 华电电力科学研究院有限公司 | 一种利用气浮轴承平衡轴向力的单级径向透平发电系统 |
US11136667B2 (en) * | 2007-01-08 | 2021-10-05 | Eastman Kodak Company | Deposition system and method using a delivery head separated from a substrate by gas pressure |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20311890U1 (de) * | 2003-08-01 | 2004-12-09 | Deublin Gmbh | Drehdurchführung für Minimalmengenschmierung |
CN107269702A (zh) * | 2017-07-20 | 2017-10-20 | 中国工程物理研究院机械制造工艺研究所 | 一种静压气体径向轴承 |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE255373C (de) | ||||
US3645590A (en) | 1970-12-17 | 1972-02-29 | Gen Motors Corp | Carbon-graphite gas-bearing roll |
DE2124918A1 (de) | 1970-05-20 | 1972-08-24 | Compagnie Industrielle Des Telecommunications Cit-Alcatel, Paris | Hochpräzisionsspindel mit aerostatischem Lager-Drucklager |
US4982126A (en) | 1988-04-29 | 1991-01-01 | Societe De Mecanique Magnetique S.A. | Auxiliary bearing having a graphite stator for a rotary shaft mounted on magnetic bearings |
US5017022A (en) | 1988-11-09 | 1991-05-21 | Allied-Signal, Inc. | High temperature bearing |
EP0471329A2 (de) | 1990-08-16 | 1992-02-19 | Schunk Kohlenstofftechnik GmbH | Verwendung von imprägniertem Elektrographit als Gleitkörper in Form von Drehschiebern und Gleitringen |
CH683844A5 (fr) | 1990-10-04 | 1994-05-31 | Suisse Electronique Microtech | Combinaison autolubrifiante de revêtements. |
EP0606970A1 (de) | 1993-01-11 | 1994-07-20 | DOW CORNING GmbH | Feste Schmiermittelzusammensetzung |
JPH06213236A (ja) | 1992-11-26 | 1994-08-02 | Canon Inc | 気体軸受 |
JPH08105443A (ja) | 1994-10-04 | 1996-04-23 | Nippon Carbon Co Ltd | 不浸透性黒鉛材料を用いた静圧空気軸受 |
US5692840A (en) | 1996-12-12 | 1997-12-02 | Phase Metrics | Crash tolerant air bearing spindle |
US5998898A (en) * | 1997-12-19 | 1999-12-07 | Matsushita Electric Industrial Co., Ltd. | Motor having hydrodynamic bearing |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3645500A (en) | 1970-08-21 | 1972-02-29 | Black & Decker Mfg Co | Throttle sleeve for fluid-powered device |
DD255373A1 (de) * | 1986-12-23 | 1988-03-30 | Akad Wissenschaften Ddr | Aerostatisches luftlager |
-
1998
- 1998-08-05 DE DE19835339A patent/DE19835339A1/de not_active Ceased
-
1999
- 1999-08-03 ES ES99950482T patent/ES2221755T3/es not_active Expired - Lifetime
- 1999-08-03 DE DE59909743T patent/DE59909743D1/de not_active Expired - Lifetime
- 1999-08-03 WO PCT/DE1999/002360 patent/WO2000008345A1/de active IP Right Grant
- 1999-08-03 US US09/508,673 patent/US6328475B1/en not_active Expired - Lifetime
- 1999-08-03 EP EP99950482A patent/EP1021660B1/de not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE255373C (de) | ||||
DE2124918A1 (de) | 1970-05-20 | 1972-08-24 | Compagnie Industrielle Des Telecommunications Cit-Alcatel, Paris | Hochpräzisionsspindel mit aerostatischem Lager-Drucklager |
US3645590A (en) | 1970-12-17 | 1972-02-29 | Gen Motors Corp | Carbon-graphite gas-bearing roll |
US4982126A (en) | 1988-04-29 | 1991-01-01 | Societe De Mecanique Magnetique S.A. | Auxiliary bearing having a graphite stator for a rotary shaft mounted on magnetic bearings |
US5017022A (en) | 1988-11-09 | 1991-05-21 | Allied-Signal, Inc. | High temperature bearing |
EP0471329A2 (de) | 1990-08-16 | 1992-02-19 | Schunk Kohlenstofftechnik GmbH | Verwendung von imprägniertem Elektrographit als Gleitkörper in Form von Drehschiebern und Gleitringen |
CH683844A5 (fr) | 1990-10-04 | 1994-05-31 | Suisse Electronique Microtech | Combinaison autolubrifiante de revêtements. |
JPH06213236A (ja) | 1992-11-26 | 1994-08-02 | Canon Inc | 気体軸受 |
EP0606970A1 (de) | 1993-01-11 | 1994-07-20 | DOW CORNING GmbH | Feste Schmiermittelzusammensetzung |
JPH08105443A (ja) | 1994-10-04 | 1996-04-23 | Nippon Carbon Co Ltd | 不浸透性黒鉛材料を用いた静圧空気軸受 |
US5692840A (en) | 1996-12-12 | 1997-12-02 | Phase Metrics | Crash tolerant air bearing spindle |
US5998898A (en) * | 1997-12-19 | 1999-12-07 | Matsushita Electric Industrial Co., Ltd. | Motor having hydrodynamic bearing |
Non-Patent Citations (3)
Title |
---|
Patent Abstracts of Japan, vol. 18, No. 583, Nov. 8, 1994 & JP 06-213236 (Canon), Aug. 2, 1994. |
Patent Abstracts of Japan, vol. 1996, No. 8, Aug. 30, 1996 & JP 08-105443 (Nippon Carbon), Apr. 23, 1996. |
W. J. Bartz et al, Luftlagerungen, Expert Verlag, 1982, ISBN 3-8169-0992-2, pp. 22 and 99. |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7066652B2 (en) * | 2002-04-11 | 2006-06-27 | Ntn Corporation | Externally pressurized gas bearing and spindle equipment using this |
US20040109622A1 (en) * | 2002-04-11 | 2004-06-10 | Yoshio Fujikawa | Externally pressurized gas bearing and spindle equipment using this |
US20080158728A1 (en) * | 2002-07-23 | 2008-07-03 | Seagate Technology Llc | Writer with helium bearing |
US20040136114A1 (en) * | 2002-07-23 | 2004-07-15 | Toffle Mark A. | Servo track writer with helium bearing |
US9236083B2 (en) | 2002-07-23 | 2016-01-12 | Seagate Technology, Llc | Writer with working fluid bearing |
US7345844B2 (en) | 2002-07-23 | 2008-03-18 | Seagate Technology Llc | Servo track writer with helium bearing |
US7136262B2 (en) * | 2002-08-21 | 2006-11-14 | Minebea Co. Ltd | Pivot assembly preloaded by laser welding for hard disk drive use |
US20060283227A1 (en) * | 2005-06-20 | 2006-12-21 | Monahan Joseph J | Rolling mill roller guide |
US11136667B2 (en) * | 2007-01-08 | 2021-10-05 | Eastman Kodak Company | Deposition system and method using a delivery head separated from a substrate by gas pressure |
US20080187266A1 (en) * | 2007-02-02 | 2008-08-07 | Takanobu Akiyama | Roll machining apparatus |
US8256963B2 (en) * | 2007-02-02 | 2012-09-04 | Toshiba Kikai Kabushiki Kaisha | Roll machining apparatus |
US20120064814A1 (en) * | 2010-09-15 | 2012-03-15 | Beers Craig M | Shaft for air bearing and motor cooling in compressor |
US8529192B2 (en) | 2010-09-15 | 2013-09-10 | Hamilton Sundstrand Corporation | Thrust bearing shaft for thrust and journal air bearing cooling in a compressor |
US8622620B2 (en) * | 2010-09-15 | 2014-01-07 | Hamilton Sundstrand Corporation | Shaft for air bearing and motor cooling in compressor |
US8517665B2 (en) | 2010-12-21 | 2013-08-27 | Hamilton Sundstrand Corporation | Thrust bearing shaft for thrust and journal air bearing cooling in an air machine |
US8734017B1 (en) | 2013-03-08 | 2014-05-27 | Hamilton Sundstrand Corporation | Air bearing shaft |
US8973848B2 (en) * | 2014-09-08 | 2015-03-10 | Efc Systems, Inc. | Composite air bearing assembly |
US20140374506A1 (en) * | 2014-09-08 | 2014-12-25 | Gunnar van der Steur | Composite air bearing assembly |
US9970481B1 (en) | 2017-09-29 | 2018-05-15 | Efc Systems, Inc. | Rotary coating atomizer having vibration damping air bearings |
CN111305912A (zh) * | 2020-02-26 | 2020-06-19 | 华电电力科学研究院有限公司 | 一种利用气浮轴承平衡轴向力的单级径向透平发电系统 |
Also Published As
Publication number | Publication date |
---|---|
DE19835339A1 (de) | 2000-02-17 |
DE59909743D1 (de) | 2004-07-22 |
WO2000008345A1 (de) | 2000-02-17 |
ES2221755T3 (es) | 2005-01-01 |
EP1021660B1 (de) | 2004-06-16 |
EP1021660A1 (de) | 2000-07-26 |
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